Estimating tectonic stress rate and state with Landers aftershocks

Modeling afterslip and aftershocks following the 1992 Landers earthquake

[1] One way to probe the rheology of the lithosphere and fault zones is to analyze the temporal evolution of deformation following a large earthquake. In such a case, the lithosphere responds to a known stress change that can be assessed from earthquake slip models constrained from seismology and geodesy. Here, we model the postseismic response of a fault zone that is assumed to obey a rate-str...

Aftershocks and Pore Fluid Diffusion Following the 1992 Landers Earthquake

Afterslip and aftershocks in the rate-and-state friction law

We study how a stress perturbation generated by a mainshock affects a population of faults obeying a rate-state friction law. Depending on the model parameters and on the initial state, the fault exhibits aftershocks, slow earthquakes, or decaying afterslip. We found several regimes with slip rate decaying as a power-law of time, with different characteristic times and exponents. The complexity...

A Model of Tectonic Stress State and RateUsing the 1994

A model of the spatial and temporal distribution of seismicity both before and after the Northridge, California earthquake has been used to estimate the background stress state, loading rate, and some parameters relating to fault friction. A detailed source model was used to calculate the stress change eld from the Northridge mainshock, which 1 was t to the spatial distribution of seismicity. A...

Rate and State of Background Stress Estimated from the Aftershocks of the 1989 Loma Prieta, California, Earthquake

Estimates of the tectonic stress state including loading rate and magnitude of background stress are derived from the spatial and temporal distribution of Loma Prieta aftershocks. This technique was previously applied to the Landers aftershock sequence Gross and Kisslinger, 1997] and is based upon the seismicity model of Dieterich 1994]. Dieterich's theory suggests that background seismicity sh...